Power-transmission device.



H. H. KURKHAN. POWER TRANSMISSION DEVICE. APPLICATION FILED OCT. 15. 19]].

Patented Dec. 31, 1918.

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INVENTOR,

H. H. KURKJIAN. POWER TRANSMISSION DEVICE.

APPLICATION FlLED OCT-15.1917. 1,289,81. Patented Dec. 31, 1918.

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t p Mk! ATTORNEY.

Specification of Letters Patent.

Patented Dec. at, rate.

Application filed October 15, 1917. Serial Ito. 196,584.

To all whom it may concern: 4

Be it known that l, GAZN H. Km- JIAN, a citizen of the United States, residingat Paterson, in the county of Passaic' and State of New Jersey, have invented certain new and useful Improvements in Power-Transmission Devices, of which the following is a specification.

- My invention relates to friction transmission means and it has for its principal obj ect to provide a transmission means, simple and inexpensive in construction'and capable of being readily applied, that may be used in place of a belt to reduce to the minimum slippage or 1ost-motion as between the driving and driven members which characterizes the use of a belt as soon as the latter stretches and therefore ceases to grip said members effectively- M invention has been devised with special re erence to the-transmission of power from the main or cam shaft to the fan shaft of an automobile engine, but it is of course useful in other adaptations. In one aspect of my invention it is an important and distinguishing feature that the rotary transmission element thereof has in effect, a tongue-and-groove peripheral engagement with the driving and driven members, being of greater diameter than the space between them, and that elastic pull means normally holds said transmission element pressing against said members; for, as distinguished from means of this class in which the transmission element is held against the driving and driven members by elastic push means, my arrangement eliminates the disposition of the parts to buckle and so conduces con-" siderably to simplicity. of construction.

In the accompanying drawings, illustrating three different forms of my invention,

Figure 1 is a front elevation of one form of my invention in operative relation to driving and driven members in an automobile ene. p I

i i 2 is a side elevation of the driving and driven members and the transmission element of my device, one of said members being shown partly in section; A

Fig. 3 is a fragmentary plan of that fond of the device shown'm Fig. 1; i v

Fig. dis a view similar to Flg. 1, but illustrating another form of the invention;

Fig. 5 is a plan view of that form of the device 'appearm in Fig. 4;

Flg. 6 is a side elevation, and Fig. 7 a sectional view of the elastic means shown in Fig. 4;

Fig. 8 is a front elevation of the third. form, showing the driving and driven members partly in section;

.Fig. 9 is a plan of the device shown in Fig. 8; and Fig. 10 shows a detail of the device shown in 'Fig. 8.

Referring, first, tothat form of the invention shown in-Figs. 1, 2 and 3, (tie the rotary driven member on the shaft carrying the fan 6 of an automobile engine and o is I' the rotary driving member on a shaft d, such as the main or cam shaft, of the engine. 6 is the rotary transmission element 0 my invention. Element e is in the same plane as members a and c and has a diameter greater than the space between said members; element e has a tongue-and-groove peripheral engagement with members a and 0, produced,

as here illustrated, by forming members as v and c with peripheral grooves and element 6- V-sha-ped in cross-section.

Element 6 has an arbor 7 whose ends project therefrom, and it is received by shaped clip g in whose ends the ends of the arbor are journaled. Element e being arranged at one side of a straight line which connects the axes of members a and c, at

the other side of said line a bracket k is attached to some fixed support, as the part i of the engine. as an arm held in place by .a single cap screw 7' penetrating it, so that it may be adjusted around the cap screw as an axis. la is a spiral spring having its ends extending longitudinally and threaded, one penetrating the clip 9 in the central plane of element 6 and the other penetrating the end of arm h; the former end is equipped with a nut Z to bear against the inside of the clip and the other end is equipped with a pair of nuts m. which clamp the arm between them and which may be shifted on the threaded end of the spring in altering the tension thereof.

Since the parts a, c e have a tongue-andgroove peripheral engagement with each The bracket is here shown aU- J screwed on the l with the other and the means 9,76 and his a p means it will be obvious l a a t, not only is the transmission of a substantially perfect nonslip character, but element e mm in perfect tracking and othee operative relation to members a d 0, without t: dients to guide it and =1- such relahTon.

In that form of the invention shown in Figs. 4 to7, the clip is a ship a #1: one end 0 formed as a 1 ge-part and the other end formed with a slot p to ve the transmimion element e 11;: an arbor f and being otherwise the sum s th l m; 6 already described) the material of the stri both sides of the slot p being bent up so as to lie in parallel planes and afio o? journals for the arbor f. A spring g,

having one end a hinge-part r connected hinge-part o by the pintle s, has its other end formd as a helix 1% and the extremity u of mid latter end shaped to the form of a polygon Into acap screw '0 for a part of the support 5 is tap a threadedpin w on which is polygonal block a: which the art at of g fits (Fig. 6). To adjust t e tension of the arm 9 the block ma be turned on the pin to and then secure fast by anut 3 'r end of the pin. Enough of the block projects as shown in Fig. Z to aflord a wrench-hold.

In the comrilction shown in Figs. 8 to 10 there are two rotary PmK elements e e havi arbors f f, and being other wise like iifie element e Pit" dy described; they are arranged on opposite sides of a bers a and 0 and the elastic means to hold each bearing against said members connects them, thuszOn the end of each arbor is a bearing piece 2 having a threaded shank 2, and the corresponding bearing pieces of. the two elements 0' are connected by a spring 3 whose ends receive the shanks 2 and have their convolutions engaged in the threading thereof.

Y The elements e (or e') are preferably composed of fiber or some other material which will obtain an efi'ective noiseless grip on the members a, c. r

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:-

1. In combination, with a support and spaced rotary driving and driven members journaled therein in the same plane, a rotary transmission element of greater diameter than the space between and having a tongue-and-groove peripheral engagement with said members, and elastic pull means holding the transmission element pressing against both of said members.

2. In combination, with a support and spaced rotary driving and driven members sesame journalcd therein in the same plane, a rotary transmission element of greater diameter than the space between and having a tongue-anthgroove peripheral engagement with said members and elastic pull means,

tongue-and-groove peripheral engagement with mid members, and elastic pull means, including a fork in which said element is journaled, holding against both of said members.

t. In combination, with a support and spaced rotary driving and driven members journaled therein in the same plane, a rotary transmission element of greater diamsaid element pressing eter than the space between and having a tongue-and-groove peripheral engagement with said members, and elastic pull means,

including an attaching device secured to the support and a; part aifording a journal for said element and connecting the same with said device, normally holding said element prws I against both of said members. 5. In comination, with a support and spaced rotary driving and driven members journaled therein in the same plane, a ro-' tary transmission element of greater diameter than the space between and having a tongue-and-groove peripheral engagement with said members, and elastic means normall' holding said element pressing against oth of said members and attached to said support, said means being adjustable on an am's parallel with the axes of said members and element.

6. In combination, with a support andspaced rotary driving and driven members journaled therein in the same plane, a m tary transmission element of greater diameter than'the space between and having a tongue-and-groove peripheral engagement with said members, and elastic means normally holding said element pressing against both of said members, said means including an arm attached to said support and having its attaching end a he ical spring;1

7. combination, with a support and spaced rotary driving and driven members journaled therein in the same plane, a retary transmission element of greater diameter than the space between and having a tongue-and-groove peripheral engagement with said members, and elastic means normally holding said element pressing against said members, said means including a springarm and an attaching device meaeie to which one end of said arm is secured ing a tongue-and-groove peripheral engagei'otatably adjustably mounted on the supment with and arranged on opposite sides 10 port. of a straight line joining the axes of said 8. In combination, with a support and members, and elastic means joining said 5 spaced rotary driving and driven members members and holding each pressing against journaied therein in the same plane, a pair of both of said members. rotary transmission elements of greater In testimony whereof I afiix my signature. 15 diameter than the space between. and hav HAIGAZN H. KURKJIAN. 

